Google officially deprecated the Files API in June 2013. Two years after the announcement, Google will formally remove the API from service in less than a month.
Twilio's communication APIs are behind the communications of many recognisable brands, including Uber, Salesforce, and AWS. In this tutorial on the Twilio Blog, Sam Agnew provides everything you need to validate phone numbers in Node/JavaScript using the Twilio Lookup API as a REST API phonebook.